IMO, the only reason we haven't been able to draw greater parallels between commlinks and the famous PocSec is because before 4e, they weren't sufficiently explored. Remember that SR tech parallels RL tech, only 'upgraded'. Sure, with a commlink you can get or change a file, link to a camera to see who's at the front door, tell your car to start up, make dinner reservations, etc. etc.; you probably could have done all that with a pocket secretary (and some of those you could explicitly do so). These days, you can even have a telepresence in the 'trix with a pocket secretary commlink, something that admittedly required a deck in previous editions. But the only functional difference between the two - or rather, between a humdrum standard-issue workaday wageslave 'deck, a corporate security deck, and a highly-modified just-as-highly-illegal cyberdeck used by criminals everywhere is that the latter two get into cybercombat and have some expectation to win - and the latter wants to be completely invisible if they can manage it.
Combat is, let's face it, a complex thing. The difference between a Ford F-150 and an APC - or better yet, a Hummer 3 and a military HMMWV - is really relatively slight, and yet taking a Hummer 3 into a combat zone is frickin' suicidal, while the more combat-built HMMWV is going to greatly increase your chance of surviving the hour. It has a few specialized design specifics that make it liable to survive combat, and while both the HMMWV and the Hummer 3 can get you to the store, pick up a big load of plywood and nails, and get both you and the stuff out into BFE to build you a shack, it's the HMMWV that's going to get you into and out of contact without going literally to pieces.
From a metagame standpoint, it's my assertion that 4e going to commlinks lost an essential piece of flavor in the Shadowrun world, and though you can still run around and browse and the like on your cute little commlink, 5e has brought back the necessity of a serious, dedicated platform to slice into a place. Sure, with a commlink you can do everything that's legal for you to do. No problem; makes sense to me. But once you get into the realm of needing to go into combat - or wanting to do some serious coding, y'know, where the cops can't raid your code - then you need to pull out the 'deck.
Enh. YMMV.